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    <title>Document</title>
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<body>
    <script>
        // await Promise实例
        // async function f(){
        //     let data = await new Promise((resolve, reject) => {
        //         setTimeout(() => {
        //             resolve('a');
        //         }, 2000);
        //     });
        //     console.log(data);
        // }

        async function f(){
            let data = await 'a';
            console.log(data);
        }

        f();
        console.log('end');
    </script>
</body>
</html>